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sqlite.go
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sqlite.go
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package sqlite
import (
"net/url"
"os"
"path/filepath"
"strings"
"github.com/fnproject/fn/api/datastore/sql/dbhelper"
"github.com/jmoiron/sqlx"
"github.com/mattn/go-sqlite3"
)
type sqliteHelper int
func (sqliteHelper) Supports(scheme string) bool {
switch scheme {
case "sqlite3", "sqlite":
return true
}
return false
}
func (sqliteHelper) PreConnect(url *url.URL) (string, error) {
// make all the dirs so we can make the file..
dir := filepath.Dir(url.Path)
err := os.MkdirAll(dir, 0750)
if err != nil {
return "", err
}
return strings.TrimPrefix(url.String(), url.Scheme+"://"), nil
}
func (sqliteHelper) PostCreate(db *sqlx.DB) (*sqlx.DB, error) {
db.SetMaxOpenConns(1)
return db, nil
}
func (sqliteHelper) CheckTableExists(tx *sqlx.Tx, table string) (bool, error) {
query := tx.Rebind(`SELECT count(*)
FROM sqlite_master
WHERE name = ?`)
row := tx.QueryRow(query, table)
var count int
err := row.Scan(&count)
if err != nil {
return false, err
}
exists := count > 0
return exists, nil
}
func (sqliteHelper) String() string {
return "sqlite"
}
func (sqliteHelper) IsDuplicateKeyError(err error) bool {
sqliteErr, ok := err.(sqlite3.Error)
if ok {
if sqliteErr.ExtendedCode == sqlite3.ErrConstraintUnique || sqliteErr.ExtendedCode == sqlite3.ErrConstraintPrimaryKey {
return true
}
}
return false
}
func init() {
dbhelper.Register(sqliteHelper(0))
}